If you need the button to redirect you to another address you can use the onclick event.
<button onclick = "location.href = 'http://someweb.com';">
<! - font awesome icon goes here ->
Or you can use a normal link
<a href="linkhere.com"> <i class = "fab fa-faceook-f"> </a>
In this case you just have to apply the style of the button to the <a> tag
You can make a very similar button using Font Awesome. Here you have a little more information:
I gave the button a bit of style to give a similar image. If the code serves you, you can copy / save it and notify me to delete this example. :)